Data transfer method, data transmission apparatus, and communication system in multi-hop relay system

An apparatus for transmitting data in a multi-hop relay system, comprising:

• a feedback receiving unit for receiving information regarding a channel linked to a first mobile station;
• a scheduler for managing data to be transmitted and scheduling transmission of the data;
• and
• a beamformer for generating an interference removal precoding matrix using the information regarding a channel, and applying the interference removal precoding matrix to data to be transmitted to a second mobile station without relaying of the relay station.

A system for performing communication in a multi-hop relay system, comprising:

• a base station;
• and
• a relay station,
• wherein the relay station receives a first data from the base station and transmits it to a first mobile station, and
• wherein the base station:
• receives information regarding a channel between the base station and a first mobile station, from the first mobile station;
• generates an interference removal precoding matrix, using the channel information;
• and transmits a second data to a second mobile station without relaying of the relay station, using the interference removal precoding matrix, when the relay station transmits the first data to the first mobile station.